I need some help please, I have a short DID that is firing inconsistently . I have tried taking it apart and cleaning it and using cape cod on all the brass parts but still no luck , I have adjusted the firing pins on different mods and still no luck. I also notice that my threads on the 510 get black quite quickly. I have a stable coil 30awg 3/4 wrap and great vapor and flavor when it does fire, I have checked the nuts are nice and tight, sometimes it fires great sometimes not at all or very weakly. Any suggestions please?
Thank you.
Thank you.

MacGyver Jr